Assassin’s Creed: Valhalla – Hidden Quests, Mythic Weapons, and Norse Secrets Buried Across England

Assassin’s Creed: Valhalla isn’t just a Viking saga — it’s a treasure chest of myth and mystery. Beneath its raids, alliances, and sieges lies a web of hidden stories, cryptic caves, and godlike artifacts that most players never find. Ubisoft designed Valhalla’s open world as a historical puzzle box: explore deep enough, and you’ll uncover fragments of Isu technology, ancient prophecies, and connections that reshape the game’s mythology.

Here’s a guide to the rarest quests, secret gear, and hidden mechanics buried in Eivor’s world — and how to uncover them.

The Hidden Quest: “The Builder’s Legacy”

One of the most mysterious side missions in the game, The Builder’s Legacy is a follow-up to the Asgard arc that exists entirely off the main path.

How to Unlock It:

1. Complete the main Asgard storyline.

2. After returning to England, sleep in your settlement bed three times.

3. A strange dream sequence will trigger — Loki’s voice whispers about “unfinished work.”

4. Follow the prompt to Jotunheim’s gateway after the next sleep cycle.

Quest Summary:
You’ll revisit a fragment of Asgard’s simulation where the Builder’s tower stands half-complete. Inside, holographic Isu projectors reveal the Builder’s true purpose — creating a “pathway to the higher realms.”

Reward:
Upon completion, Eivor receives The Builder’s Eye, a hidden trinket that grants +2 Assassination damage when undetected for 30 seconds. It doesn’t appear in inventory menus — it’s coded as a passive bonus only active in stealth missions.

The Mysterious Isu Temple Beneath Stonehenge

Stonehenge is more than a synchronization point — it’s the entrance to a secret Isu vault. Most players visit once for the standing-stone puzzle and leave, never realizing what lies beneath.

How to Enter:

1. Return to Stonehenge at night during a thunderstorm.

2. Align the stones again — the hidden entrance lights up when the weather is correct.

3. Dive into the small lake nearby to reveal a submerged tunnel.

Inside lies a glowing chamber filled with Isu inscriptions and three interactable pedestals. Activating all of them opens a hidden alcove containing the Spear of Hyperion, a legendary weapon with a passive “light surge” effect that blinds enemies after critical hits.

The spear cannot be upgraded or sold — it’s a true artifact of the First Civilization, one of Valhalla’s rarest treasures.

The Hidden Armor Set: The Hidden Ones Master Outfit

Everyone knows about the Hidden Ones armor — but there’s a second version of it tucked away behind an unmarked Assassin tomb.

How to Find It:

1. Go to Lincolnscire, northeast of Aelfgarstun.

2. Enter the old Roman sewer ruins using Odin’s Sight to reveal a breakable wall.

3. Drop into a vast underground temple filled with traps.

4. Collect three Hidden Ones seals scattered across the chamber.

Once you place the seals on the altar, a hidden compartment opens revealing the Master Hidden Ones Armor, a darker version with increased critical hit rate and reduced detection speed.

This set is perfect for players who favor pure stealth over open combat — and it’s completely separate from the original armor questline.

The Secret of the Hidden Lake Monastery

Not all mysteries involve gods and technology — some hide pure mechanical rewards. South of Ledecestrescire, there’s a lake monastery unmarked on the map.

How to Discover It:

1. Sail down the Trent River from your settlement until you hear church bells.

2. Dock on a small peninsula surrounded by birch trees.

3. Enter the monastery and find an unlit brazier behind the altar.

Lighting it triggers an ambush event where zealots attack from all sides. Defeat them, and a locked crypt opens beneath the church floor.

Inside:

• A Holy Relic that boosts Adrenaline generation by 20%.

• A hidden letter from the pre-Assassin order referencing “the first creed.”

This encounter is unmarked, repeatable, and drops rare upgrade materials every time you revisit.

The Forgotten Cave of Trials in Norway

Before leaving for England, Eivor can access one of the game’s toughest secret challenges — a series of traps and puzzles in the northern mountains of Rygjafylke.

How to Reach It:

1. From Fornburg, ride north to the highest peak near the frozen fjord.

2. Look for a small cave entrance with runes carved above it.

3. Inside, you’ll find pressure plates, swinging axes, and spike corridors — the earliest prototype of the later Tombs of the Fallen DLC.

At the final chamber sits a golden chest containing the Odin’s Trial Amulet, an accessory that reduces fall damage by 50%.

Completing the cave also triggers a rare voice line from Randvi later in the story where she references “the old gods testing your patience.”

The Hidden Dialogue Between Eivor and Basim

After the truth about Basim’s identity is revealed, returning to Norway unlocks an optional conversation that most players never see.

How to Trigger It:

1. Finish the main story and let Basim live.

2. Return to the Hidden Ones Bureau in Hordafylke.

3. Use Odin’s Sight inside the vault to highlight a single glowing mural.

4. Interact to trigger a memory echo — Basim’s voice speaks through the walls, commenting on “the cycle of vengeance.”

This dialogue subtly foreshadows events in Assassin’s Creed Mirage and connects Eivor’s story to the future of the Assassin lineage.

The Secret Mechanics of Odin’s Sight

Odin’s Sight does more than highlight enemies — it has hidden passive layers.

Unlisted Effects:

• Detects illusory walls in Isu ruins when pulsed twice in rapid succession.

• Briefly marks off-screen archers with a white shimmer (even through fog).

• Increases stealth damage by 10% for 10 seconds after use, stacking twice.

Most players use it reactively, but mastering double-pulse timing reveals countless hidden paths and loot caches in late-game regions like Eurvicscire and Glowecestrescire.

Bonus Tip: Infinite Opal Loop

The in-game Helix Opal currency can be farmed infinitely without exploits if you understand its respawn rules.

How To Do It:

1. Locate any Daily Contract “Opal” marker on the map.

2. Complete it, then fast travel two regions away and meditate for 48 in-game hours.

3. Return — the Opal chest respawns with new loot.

Combining this with the weekly Reda quests can earn you 400+ Opals in one session — all completely legitimate, no external tools needed.

Why Valhalla’s Secrets Matter

Beneath Valhalla’s massive map lies Ubisoft’s most ambitious hidden world. Every unmarked vault, Isu temple, and cryptic mural carries pieces of a story that spans millennia — the eternal struggle between gods, men, and memory.

Valhalla doesn’t just reward exploration — it immortalizes it. For players who look beyond icons and quests, the game becomes an archaeological adventure through myth itself.